Free Gas Redemption / reimbursement not received as promised

I purchased tires @ Tire Kingdom and rec'd vouchers / instructions to 'redeem' receipts for free gas...prepaid 'visa' card of some sort was to be exchanged for gas receipts. No prepaid cards have been received by me and I have been submitting receipts for months now.
I do see that I am not the only one scammed by this...is there any way to recover anything from this ??? I only bought the tires because of the 'special' that was offered w/the free gas.
Is a class action lawsuit applicable?????